A four-membered chelate complex of Cu(II) with creatinine
TL;DR: In this article, the complex formation between creatinine and Cu(II) was studied by means of electronic, IR and EPR spectroscopy, and spectral data showed the formation of a four-membered chelate with distorted rhombic structure.
About: This article is published in Polyhedron.The article was published on 1985-01-01. It has received 19 citations till now.
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TL;DR: In this paper, the 1:1 proton transfer compound LH2, (creatH)+ (pydcH)−, has been prepared from the reaction of creatinine, creat, and dipicolinic acid, pydc h2, pyridinedicarboxylic acid, and characterized using IR, 1H and 13C NMR spectroscopy.
Abstract: The 1:1 proton transfer compound LH2, (creatH)+ (pydcH)−, has been prepared from the reaction of creatinine, creat, and dipicolinic acid, pydcH2, (2, 6- pyridinedicarboxylic acid) and characterized using IR, 1H and 13C NMR spectroscopy. The first coordination complex (creatH)[Zn(pydc)(pydcH)]·4H2O, was prepared using LH2 and zinc(II) nitrate, and characterized using IR, 1H and 13C NMR spectroscopy and single crystal X-ray crystallography. The crystal system is triclinic with space group with two molecules per unit cell. The unit cell dimensions are a = 8.085(2) A, b = 10.802(4) A, c = 13.632(4) A, α = 104.98(2)°, β = 90.31(2)° and γ = 92.55(3)°. The structure has been refined to a final value for the crystallographic R factor of 0.0381 based on 3003 reflections. The zinc atom is six-coordinated with a distorted octahedral geometry. The (pydc)2− and (pydcH)− units are almost perpendicular to each other. Extensive hydrogen bondings between carboxylate groups, (creatH)+ and water molecules throughout the zinc(II) complex as well as π–π stacking and ion pairing play important roles in stabilizing the corresponding lattices. The protonation constants of the building blocks of the pydcH2-creat adduct, the equilibrium constants for the reaction of (pydc)2− with creat and the stoichiometry and stability of the ZnII complex with LH2 in aqueous solution were accomplished by potentiometric pH titration. The solution studies support a self-associated (creatH)+(pydcH)− as the most abundant species at pH = 3.4. The stoichiometry of the crystalline complex (i.e. (creatH) [Zn(pydc)(pydcH)])and that of the most abundant species detected in solution were found the same.
54 citations
TL;DR: In this article, the ability of the important bioligands creatinine and creatine to form various types of complexes with different metal ions is summarized and the crucial role of the nature of the reaction medium in complex formation with these ligands is emphasized.
34 citations
TL;DR: With the simultaneous measurement of creatinine and albumin in urine, the albumin/creatinine ratio can be determined effectively reducing or eliminating the occasional false-negative and false-positive result in those with dilute or concentrated urines, respectively.
28 citations
TL;DR: In this paper, the authors reported the synthesis of two green recoverable catalysts by covalent linking of the creatinine La and Pr complexes on an MCM-41 mesostructure with the commercially available materials and via a simple and inexpensive procedure.
Abstract: In the present study, we report the synthesis of two green recoverable catalysts by covalent linking of the creatinine La and Pr complexes on an MCM-41 mesostructure with the commercially available materials and via a simple and inexpensive procedure. These heterogeneous catalysts were characterized by Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, N2 adsorption and desorption, inductively coupled plasma optical emission spectroscopy, and thermogravimetric analysis. The obtained mesostructures act as active and reusable catalysts for the oxidation of sulfides and oxidative coupling of thiols under neat conditions. More importantly, significant practical advantages of this environmentally friendly process include high efficiency, good reaction times, and convenient recovery and reusability for several times without any significant loss of activity of the catalyst.
27 citations
TL;DR: Pt(II) and Pd(II)-complexes with creatinine, C3H2N2(O)(CH3)NH2, were synthesized in this paper and a model for coordination of the ligands to the central atoms was confirmed by X-ray structural investigation.
26 citations
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24 citations
Abstract: Phenylmercury(II) replaces a proton of creatine, H2NC+(NH2)NMeCH2C02-, in basic solution to form the zwitterionic
complex PhHgNHC+(NH2)NMeCH2CO2-. Creatine and creatinine (C4H7N30) react with PhHg((OH)N03)I/2 in aqueous ethanol to form a 2:l complex [(PhHg)2(C4H6N30][N03] which exists in two crystalline forms. Creatinine forms a 1:l
complex [PhHg(C4H7N30)][N03].1/2H20 at pH 1.4 on reaction with PhHg((OH)N03)l/2 in the presence of nitric acid.
The 1:l and 2:l complexes may be interconverted. Creatinine hydronitrate, [H2NCNMeCH2CONH][NO3], and the PhHg(II) complexes of creatinine have similar infrared (including deuterated derivatives) and 1H NMR spectra, consistent with retention of the creatinine ring and presence of a guanidinium group in the complexes. An X-ray structural analysis of one crystalline form of the 2:l complex shows bonding of PhHg(II) groups to the exocyclic and ring nitrogens of creatinine to form the cation
[PhHgNHCNMeCH2CONHgPh]+.
23 citations
TL;DR: In this paper, the electronic spectra and magnetic moments suggest a d7 configuration for cobalt: a tetrahedral geometry (4.4 B.M.) for halide and thiocyanate complexes, and an octahedral geometry for the carboxylate complexes.
Abstract: Cobalt(II) complexes of creatinine [Co(creat)2X2] (X = Cl, Br, I or NCS) and [Co(creat)2X2(H2O)2] (X = HCO2, HOCH2CO2 or CNCH2CO2) have been prepared. Their i.r. spectra show an increase in ν(NH) of the cyclic secondary amine group, compared to free ligand (3300 cm−1), indicating that cyclic nitrogen is involved in coordination. The thiocyanate group coordinates through nitrogen and carboxylates coordinate as univalent unidentate ligands. The electronic spectra and magnetic moments suggest a d7 configuration for cobalt: a tetrahedral geometry (4.4 B.M.) for halide and thiocyanate complexes, and an octahedral geometry (5.0 B.M.) for the carboxylate complexes. On heating, the ligand moiety is lost and the respective cobalt halide or cobalt carboxylate is formed, which is converted finally into Co3O4. There is a correlation between the high intensity electronic transitions and the polarographic half-wave potentials.
18 citations
TL;DR: The electron spin resonance of frozen solutions of a range of copper complexes of Schiff bases with amino acids as a component of the base have been measured at 110 K as mentioned in this paper, and the complexes appear to be of distorted planar structure with two nitrogen and two oxygen coordinating groups.
10 citations